Finite element simulation of ultra low cycle fatigue cracking in steel structures
Finite element simulation of ultra low cycle fatigue cracking in steel structures
复制标题
DOI：
10.1016/j.jcsr.2013.07.007
复制
发表时间：
2013-10-01
影响因子：
4.1
通讯作者：
Engelhardt, M. D.
中科院分区：
文献类型：
--
作者：
Amiri, H. R.;Aghakouchak, A. A.;Engelhardt, M. D.
本文提出了一种模拟地震中大振幅循环应变作用下钢结构韧性断裂的新方法。该方法是基于现有的微力学模型开发的，该模型最初用于预测超低周疲劳（ULCF）的裂纹萌生。它涉及在传统非线性有限元框架内逐步模拟材料退化。通过模拟结构细节（柱与底板连接）的断裂，验证了该方法的有效性，该结构细节之前已经进行了多次循环试验。结果表明，该方法能较好地预测裂纹位置、裂纹扩展路径、裂纹起裂对应的循环次数以及最终断裂。(C) 2013 Elsevier Ltd.版权所有。
This paper proposes a new method of simulating ductile fracture in steel structures under large amplitude cyclic straining experienced in earthquakes. The method is developed based on an existing micromechanical model originally proposed for predicting crack initiation in ultra-low cycle fatigue, ULCF. It involves a step-by-step simulation of material degradation within the framework of conventional nonlinear FEM. The method is validated through simulating fracture in a structural detail (column-to-base plate connection) for which several cyclic tests has been previously conducted. It is found that the method can successfully predict the cracking site, its propagation path, the number of cycles corresponding to crack initiation, and also final fracture. (C) 2013 Elsevier Ltd. All rights reserved.